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#www tluited ISAAC T. PACKARD, OF CHICAGO, ILLINQIS.

Letters Patent No. 88,328, dated Ma/rch 30, 1869.

TREMOLO-REGULATOR FOR REED MUSICAL INSTRUMENTS.

The Schedule referred to in these Letters Patent and making part of the sama.

Be it known that I, ISAAC T. PACKARD, of Chicago, in the county of Cook, and State of Illinois, have. invented a new and useful vMode of' Regulating the Revolutions of the Propellii1g-\Vheel Used in Reed Musical Instruments, for the purpose of operating a fanwheel, or a roller, which produces the tremolo quality of tone; 'and I do declare the following tol be a full and correct description of the same, reference being had to the accompanying diawin g, making a part ofthis specification, and the letters of reference thereon.

This invention consists ofan automatic arrangement, whereby a lever, attached to the bellows, operates upon a ii'iction-spring'aml upon a valve, or upon either, separately, in such a manner as to regulate the velocity of the propelling-wheel.

The drawingrepresents a transverse section of a suction-bellows, similar to those used by many makers of reed musical instruments, together with the wind-chest and the tremolo-propelling wheel.

A is the bellows.

B is the exhauster which draws the air from the bollows, and also from the wind-chest C, and from the box D, which encloses the propelling-wheel.

Ou the top ofthe box D is a valve, marked F, which, upon being opened when the bellows is exhausted, admits the air, which puts the wheel in motion as the air is drawn through to the bellows.

My invention consists, first, of the application ofthe lever E and the friction-spring G. The lever E is attac-hed to the bellows at the joint of the movable part, which is at H.

Here the lever enters the bellows, and runningr upward, passes through an aperture in the wind-chest; then turning to the left, goes nearly as far as the box over the wheel; then turning upward, terminates with a hole, through which the friction-spring G can pass freely. This lever and spring are so placed that the spring passes along under the axis of the wheel 0n the outside of the box.

The operation of the lever and friction-spring is as follows:

The valve F being opened, and the process of eX- haustion of the bellows commenced, the wheel begins to revolve, and if the exhausting is carried to its full extent, the force increases, and the wheel naturally accelerates. But this is here prevented, as the bellows, in closing, moves to the left, and consequently the lever E, at the part where the spring passes through at j, rises upward and carries up the spring, which, pressing against the axis of the wheel, retards its motion.

The spring, which is made of about No. 18 hard brass wire, isreadily and easily graduated so as to cause and the valve permitsless air to be 'drawn through, the

valve being closed bythe actionof the spring (l.

Thus it will be seen, that by the action of the air alone, when controlled by the valve a, and its connections, or by thefriction-spring alone, with its connections, or by both together, I am enabled to control the movement of the wheel and secure greater uniformity in its revolutions. My preference is, however, given to the action of the friction-spring alone, as this is'so easily adjusted, and more delicate and sensitive in its action.

Having now described my invention, its manner of construction and use,

What I claim, and desire Letters Patent therefor, is as follows:

I claim the lever E, the friction-spring G', the valve a, and the tracker e, when they are made as herein described, or equivalent thereto, and operated and used for the purpose herein set forth.

ISAAC T. PACKARD.

Witnesses:

R. F. KEITH, W. O. PRATT. 

